exgtinows4

Ok...on the 997.2S, I know that right way to upgrade front brakes is gt3 calipers and turbo rotors for proper fittment. But here is what I don't understand...if giro disks and other can make a 350mm that works with stock 997.2S calipers - why doesn't the turbo 350mm rotor work directly with the stock calipers? What fails in that set up? Any one go through this? Thx

platinum997

I'm not the best at brake combos so validate this.

My understanding is the 350mm with c2s calipers require a caliper spacer to make up for the extra 20mm. The gt3 calipers are built for 350mm so don't require the spacer.

350mm on c2s calipers are more for cooling than stopping since the pads are the same size. With the 350mm and gt3 calipers you get more pad also.

Hatzenbach

The GT3 rotor has a different offset so it won't fit. I am not sure if the same holds true for the Turbo rotor as well

exgtinows4

Hmmm... Do giro disks and other aftermarket rotors 350mm also need these spacers? I wonder if w can buy these and use a OEM 350 mm rotor for much less expense?

scorcherjf

I believe the Turbo 350mm rotors will work with the C2S if you have the right caliper spacers. Girodisc provides a 12mm spacer when you get their 350mm rotor with the C2S. You would surmise that since the rotor is 350mm (20mm over more than OEM in diameter, or 10mm more in radius), you would only need a 10mm spacer but they provide 12mm to push out the caliper a bit since with the OEM setup, the pad is actually a bit recessed and the OEM rotor wears down with a lip on the outer edge.

Also, the Girodisc part number for the 350mm rotor for the C2S and the Turbo (non ceramic) are the same.

Hatzenbach

and here's the thread with (hopefully) all the answers:
http://www.6speedonline.com/forums/9...1-s-non-s.html

exgtinows4

I did read that thread - but its all about upgrading BOTH calipers and rotors together. I am interested in only running 350mm rotors with existing calipers..

nwGTS

Girodisc sells 350mm upgrade for the front and rear of 997.2 CS.
With it comes two spacers for each caliper that allow the OEM caliper to fit the 350mm rotor.
Rear: http://www.girodisc.com/Girodisc-Rea...4S_p_6561.html
Front: http://www.girodisc.com/Girodisc-Fro...4S_p_6549.html
"The Girodisc system is a direct replacement for the OE disc with the addition of our provided caliper spacers and longer bolts to accommodate the larger 350mm rotor."

I imagine the hats on these rotors match at least one other model 997 with 350mm rotors (probably the turbo). So you could save some money by getting the girodisc spacers and then OEM rotors (or equivalent) that match the Girodisc hat.

But honestly man you have enough info here. Just call Girodisc to get the spacers and confirm what OEM equivalent their 350mm rotors are. Here's their contact info spoon fed:

360-306-3263
sales@girodisc.com

exgtinows4

Thanks ...will call them and report back.

Hatzenbach

If you just need the spacers and the bolts
I have an OEM set from Girodisc for sale: 4 spacers and 4 bolts, brand new, never used, still in package.
PM me if interested

Hatzenbach

OK, I posted the Girodisc h/w I have for sale in the classifieds
https://rennlist.com/forums/parts-ma...onversion.html

Hatzenbach

Kit is SOLD.
Based on the interest I got, my price was probably waaaaaay too low ;-)
Anyways, hope the new owner enjoys them.

Jack667

I have the GiroDisc 350mm 'conversion' on the front of my .1S, and I think there's another thread where people talk about that kit. Opinions seemed to be 50/50 (from memory), or even slightly negative, about the idea of pairing 350mm discs with calipers designed for 330mm.
I've done two track events so far and I'm happy with the status of the rotors, compared to previous cheaper cross-drilled.
I know that it's hard to justify economically, but so are many other 'upgrades' for our cars!